/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation

class SimulatorPedometer: Pedometer {

  struct Data: PedometerData {
    let steps: Int
    let distanceTravelled: Double
  }

  var pedometerAvailable: Bool = true
  var permissionDeclined: Bool = false

  var timer: Timer?
  var distance = 0.0

  var updateBlock: ((Error?) -> Void)?
  var dataBlock: ((PedometerData?, Error?) -> Void)?

  func start(
    dataUpdates: @escaping (PedometerData?, Error?) -> Void,
    eventUpdates: @escaping (Error?) -> Void) {

    updateBlock = eventUpdates
    dataBlock = dataUpdates
    
    timer = Timer(timeInterval: 1, repeats: true,
                  block: { timer in
                    self.distance = self.distance + 1
                    print("updated distance: \(self.distance)")
                    let data = Data(steps: 10,
                                    distanceTravelled: self.distance)
                    self.dataBlock?(data, nil)
    })
    RunLoop.main.add(timer!, forMode: RunLoop.Mode.default)
    updateBlock?(nil)
  }

  func pause() {
    stop()
  }

  func stop() {
    timer?.invalidate()
    updateBlock?(nil)
    updateBlock = nil
    dataBlock = nil
  }
}
